低浓度酒石酸水溶液的电导预测

Conductivity Prediction of Tartaric Acid in Aqueous Solution at Low Concentration

多元有机酸是常见的不对称弱电解质 ,水溶液中物种之间存在着一定的离解和缔合平衡 ,因此它们的溶液行为较为复杂 对于这类不对称电解质水溶液的电导研究 ,虽然已有一些进展 ,但还远远满足不了工业上对电导数据的需求 为此作者以酒石酸这一典型的二元酸为例 ,充分考虑此类电解质水溶液的特点 ,认为溶液摩尔电导率是溶液中各种离子物种电导的贡献之和 ,按作者近期提出的离子物种电导新方程 ,预测了低浓度下酒石酸水溶液的摩尔电导率 ,并与文献值和三参数Quint -Viallard电导方程的计算值进行了比较 结果表明 。

Organic multi basic acids are weak and unsymmetrical electrolytes. Because there are dissociation and association equilibria among the species of these acids in their aqueous solutions, the behavior of these solutions is rather complex. Study on conductivity of this type of electrolytes is more difficult than 1 to 1 valence strong electrolytes. Conductivity data about these electrolytes are far from enough to meet the need of industry. Tartaric acid is taken as a typical example in this paper, and it is considered that the molar conductivity of solutions is equal to the sum of the ionic contributions. The molar conductivities of the solution and relevant ions are calculated respectively employing a new prediction equation of ionic conductivity proposed in our previous paper. The results calculated from the new equation are compared with those from literatures and Quint Viallard′s conductance equation. The results obtained reveal that the method presented in this paper is reliable and practical.